2 month old Starbucks NGO turbochef oven has been tripping high limit. Reset and unit cycles properly. Returned 6 days later to find the same problem, they suggested replacing high limit. 2 days later returned to find high limit tripped again, manufacturer tech walk through all tests done last two visits, by the book, and says replace the control board. Replaced it that day and now returned to the high limit tripped almost a month later. RTD probe checks out like it has but still told to replace it??♂️. Headed to it now….. Any ideas???
Thankfully all that parts replacing was under warranty and THEY told you to do it.
I’ve often wondered whether their tech support merely queries the service manuals when helping their callers.
I recently had a Sota which wouldn’t run the blower motors. I followed their troubleshooting tree in the service manual to the LETTER – which lead me to replacing the control board. I installed one and…it still didn’t work.
My being an in-house tech, I had the luxury of deciding to go cannibalize a motor control board from a spare i3 oven (also with two motors & same part number).
THAT was the problem.
I wish I’d done that in the first place.
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Since ECM motors have become more prevalent in newer equipment, I’d sure like the manufacturers to offer more accurate guidance on troubleshooting them.
There might BE on the HVAC/R side of all this newer technology, but (as of ten years ago) I’m not doing that anymore.
One thing’s for sure: There will ALWAYS be something NEW to learn in these skilled trades.
Good luck with all that for you younger ones. I’m glad to see you’re out there taking over for us geezers.
Heard that brethren. That’s why this industry was my top choice, that and I love science…. Young and super tech is a great money maker, blue collar is the new white collar I say. We all will be hurting soon if we can’t get enough decent thinkers out here.
Turbo Chef’s are sensitive to many things. Like cleaner and outside heat sources. Also the catalytic unit doesn’t like some foods. Like sodium and potassium salts in bacon. So one has to take the time to talk to the staff that use it. The only way to get the whole picture.
Has there been any fault codes posted?
Now being the heater, catalyst element and the high temp sensor are together, It sounds like you have a air flow problem. The believe that the RTD is in the upper fan duct. So I’d be looking at that motor/controller and air the path to it. Being a new machine, it may not have been assembled correctly. I hate call-backs. But when you get one, you have to check everything and you learn a lot.